I am still going through my box 'o' salvaged rotators and came across a Mystery rotator. It looks a lot like an Alliance U-100, but can accommodate a slightly larger mast. It also is a 5 wire rotator, not 4. The 'weather proofing' ring is black. And the connection screws are in a different pattern than the Alliance T45 or C225 rotators.
I posted some pictures to a small write up here: http://www.kk0sd.net/mystery/mystery.htm
Finally, Does anyone know off the top of their head which screw on a Channelmaster 3 wire rotator is CW, which is CCW and which is the common?
I appreciate you taking the time to look.